WO2016106714A1 - Procédé, appareil, et système de transmission de données - Google Patents

Procédé, appareil, et système de transmission de données Download PDF

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Publication number
WO2016106714A1
WO2016106714A1 PCT/CN2014/095979 CN2014095979W WO2016106714A1 WO 2016106714 A1 WO2016106714 A1 WO 2016106714A1 CN 2014095979 W CN2014095979 W CN 2014095979W WO 2016106714 A1 WO2016106714 A1 WO 2016106714A1
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WIPO (PCT)
Prior art keywords
optical
mode
line terminal
link
optical signal
Prior art date
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PCT/CN2014/095979
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English (en)
Chinese (zh)
Inventor
殷锦蓉
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2014/095979 priority Critical patent/WO2016106714A1/fr
Priority to CN201480077221.7A priority patent/CN106664638A/zh
Priority to EP14909522.6A priority patent/EP3232713A4/fr
Publication of WO2016106714A1 publication Critical patent/WO2016106714A1/fr
Priority to US15/640,167 priority patent/US20170302399A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795—Performance monitoring; Measurement of transmission parameters
    • H04B10/07953—Monitoring or measuring OSNR, BER or Q
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2581—Multimode transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/04—Mode multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0066—Provisions for optical burst or packet networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2210/00—Indexing scheme relating to optical transmission systems
    • H04B2210/25—Distortion or dispersion compensation
    • H04B2210/254—Distortion or dispersion compensation before the transmission line, i.e. pre-compensation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0024—Construction using space switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0049—Crosstalk reduction; Noise; Power budget

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, apparatus and system for data transmission in the field of communications.
  • FIG. 1 The structure of the existing passive optical network (PON) system is shown in Figure 1: including an optical line terminal (OLT) at the central office, and one for branching/coupling or multiplexing/solution.
  • OLT optical line terminal
  • ODN multiplexed optical distribution network
  • ONUs optical network units
  • ONTs optical network terminals
  • the OLT provides a network side interface to the PON system and connects one or more ODNs.
  • the ODN is a passive optical splitting device that transmits the downlink data of the OLT to each ONU, and simultaneously transmits the uplink data of multiple ONUs/ONTs to the OLT.
  • the ONU provides a user-side interface for the PON system, and the uplink is connected to the ODN. If the ONU directly provides the user port function, such as an Ethernet user port for accessing the Internet through a computer, it is called an ONT. Unless otherwise stated, the ONUs mentioned below refer to ONUs and ONTs.
  • the ODN is generally divided into three parts, a passive optical splitter, a split fiber, a distributed fiber, and a branch fiber.
  • the distributed fiber and the branched fiber may be collectively referred to as a branch fiber.
  • the figure shows an ODN structure diagram with two-stage splitting. For an ODN with only one-stage splitting, there are only trunk fibers and branch fibers.
  • the OLT to the ONU is called downlink, and vice versa.
  • the downlink data is broadcast to each ONU because of the characteristics of the optical.
  • the uplink data transmission of each ONU is allocated by the OLT to transmit the interval, and time division multiplexing.
  • the uplink and downlink lights can be transmitted in the same fiber, and the uplink and downlink can also be transmitted by using one fiber.
  • the PON network acts as an optical access network. Although the bandwidth is sufficient for ordinary home users, With the development of wireless mobile communication networks and the adoption of networked modes of distributed base stations, the bandwidth requirements for mobile bearers have increased dramatically. The existing mobile bearer solutions have been unable to meet the demand, and it is urgent to provide a new type of large bandwidth.
  • the widely covered PON network acts as a mobile bearer network solution.
  • the embodiment of the invention provides a data transmission method, device and system, which realizes the transmission of big data by increasing the transmission capacity of a single optical fiber, thereby realizing the bandwidth requirement in the mobile bearer field, and greatly improving the total bandwidth utilization of the system. rate.
  • a method for data transmission is provided, the method being applied in a space division multiplexing system, the space division multiplexing system comprising at least: an optical line terminal, a mode multiplexer, a mode demultiplexer, a beam splitter and an optical network unit, wherein the optical line terminal is connected to the mode multiplexer through a single mode fiber, and the mode multiplexer is connected to the mode demultiplexer through a mode-less optical fiber, the mode The demultiplexer is connected to the optical splitter by a single mode fiber, and the optical splitter is connected to the optical network unit, the method comprising:
  • the mode multiplexer receives the first optical signal sent by the optical line terminal from the input port;
  • the mode multiplexer converts the received first optical signal into a second optical signal of a mode corresponding to the input port according to a corresponding relationship between an input port of the optical signal and a mode of the optical signal;
  • the mode multiplexer multiplexes the converted second optical signal into at least a mode fiber, wherein the number of modes supported by the mode-less fiber is between a multimode fiber and a single mode fiber.
  • the method further includes:
  • the optical line terminal sends a first training sequence to the optical network unit;
  • the optical line terminal estimates, according to the first training sequence, a first crosstalk channel coefficient of a first crosstalk on a first link between the optical line terminal and the optical network unit, where the light
  • the first crosstalk on the first link between the line termination and the optical network unit is another one or more optical line terminations sharing the same small mode fiber with the first link to another optical network unit Crosstalk between the optical signal of the second link and the first link; obtaining a pre-emphasis coefficient according to the estimated first crosstalk channel coefficient.
  • the method further includes:
  • the optical line terminal pre-emphasizes the optical signal to be transmitted on the first link according to the pre-emphasis coefficient to eliminate crosstalk.
  • the method further includes:
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received first error rate.
  • the method further includes:
  • the line terminal receives the second training sequence sent by the optical network unit;
  • the line terminal performs a second crosstalk channel coefficient estimation on a second crosstalk on the first link between the optical network unit and the optical line terminal according to a second training sequence sent by the optical network unit,
  • the second crosstalk on the first link between the optical network unit and the optical line terminal is another one or more optical line terminals sharing the same small mode fiber with the first link to another Crosstalk of the optical signal of the second link between the one or more optical network units to the first link;
  • the line terminal obtains a crosstalk cancellation coefficient according to the estimated second crosstalk channel coefficient.
  • the method further includes:
  • the optical line terminal processes the optical signal received on the first link according to the crosstalk cancellation coefficient to eliminate crosstalk.
  • the method further includes:
  • the optical line terminal calculates a second error rate according to the optical signal sent by the optical network unit
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received second error rate.
  • the method further includes:
  • the mode demultiplexer receives the second optical signal sent by the mode multiplexer
  • the mode demultiplexer determines an output port corresponding to a mode of the received second optical signal according to a correspondence between an output port of the optical signal and a mode of the optical signal;
  • the mode demultiplexer converts the second optical signal into a single mode optical signal, and outputs the converted single mode optical signal from the determined output port.
  • a method for data transmission is provided, where the method is applied in a space division multiplexing system, the space division multiplexing system at least comprising: an optical line terminal, a mode multiplexer, a mode demultiplexer, a beam splitter and an optical network unit, wherein the optical line terminal is connected to the mode multiplexer through a single mode fiber, and the mode multiplexer is connected to the mode demultiplexer through a mode-less optical fiber, the mode The demultiplexer is connected to the optical network unit through a single mode fiber, and the optical splitter is connected to the optical network unit, wherein the number of modes of the optical signal transmitted in the small mode optical fiber belongs to the multimode optical fiber and the single Between the mode fibers, the method includes:
  • the optical line terminal sends a first training sequence to the optical network unit;
  • the optical line terminal estimates, according to the first training sequence, a first crosstalk channel coefficient of a first crosstalk on a first link between the optical line terminal and the optical network unit, where the light
  • the first crosstalk on the first link between the line termination and the optical network unit is another one or more optical line terminations sharing the same small mode fiber with the first link to another optical network unit Crosstalk between the optical signal of the second link and the first link;
  • the optical line terminal obtains a pre-emphasis coefficient according to the estimated first crosstalk channel coefficient
  • the optical line terminal pre-emphasizes the optical signal to be transmitted on the first link according to the pre-emphasis coefficient to eliminate crosstalk.
  • the method further includes:
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received first error rate.
  • the method further includes: at the beginning of the start of the optical line terminal startup or the start of operation of the optical network unit, the line terminal receives the first sent by the optical network unit Second training sequence;
  • the second crosstalk on the first link between the optical network unit and the optical line terminal is another one or more optical line terminals that share the same small mode fiber with the first link.
  • the optical line terminal obtains a crosstalk cancellation coefficient according to the estimated second crosstalk channel coefficient.
  • the method further includes:
  • the optical line terminal processes the optical signal received on the first link according to the crosstalk cancellation coefficient to eliminate crosstalk.
  • the method further includes:
  • the method further includes:
  • the optical line terminal calculates a second error rate according to the optical signal sent by the optical network unit
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received second error rate.
  • a mode multiplexer comprising:
  • a first port processing unit configured to receive, by the first input port, a first optical signal sent by the optical line terminal; and, according to an instruction of the first processor, multiplex the converted second optical signal into the at least one mode fiber for transmission;
  • the first processor is configured to convert the received first optical signal into a second optical signal in a mode corresponding to the input port according to a correspondence between an input port of the optical signal and a mode of the optical signal;
  • the port processing unit multiplexes the second optical signal into at least a mode fiber, wherein the number of modes supported by the mode-less fiber is between a multimode fiber and a single mode fiber.
  • an optical line terminal includes:
  • a first transmitter configured to send a first training sequence to the optical network unit at the beginning of the optical line terminal, and send the pre-emphasized optical signal according to an instruction of the second processor
  • the second processor is configured to perform, according to the first training sequence, a first crosstalk channel coefficient of a first crosstalk on a first link between the optical line terminal and the optical network unit, where The first crosstalk on the first link between the optical line terminal and the optical network unit is another one or more optical line terminals sharing the same small mode fiber with the first link to another one or more Crosstalk of the optical signal of the second link between the optical network units to the first link; obtaining a pre-emphasis coefficient according to the estimated first crosstalk channel coefficient; according to the pre-emphasis coefficient, The optical signal to be transmitted on the first link is pre-emphasized; and the transmitter is instructed to transmit the pre-emphasized optical signal.
  • the optical line terminal further includes include:
  • a first receiver configured to receive a first error rate sent by an optical network unit connected by the first link
  • the second processor is further configured to adjust the pre-emphasis coefficient according to the received first error rate
  • the first transmitter is further configured to send the pre-emphasized optical signal according to an instruction of the second processor.
  • the first receiver is further configured to: when the optical line terminal starts working, or the optical network unit starts working, the line terminal Receiving a second training sequence sent by the optical network unit;
  • the second processor is further configured to perform, according to the second training sequence sent by the optical network unit, a second crosstalk on the first link between the optical network unit and the optical line terminal.
  • Estimating a crosstalk channel coefficient wherein the second crosstalk on the first link between the optical network unit and the optical line terminal is another one or more of the same small mode fiber shared with the first link Crosstalk of the optical signal of the second link between the optical line terminal and the other optical network unit to the first link; obtaining a crosstalk cancellation coefficient according to the estimated second crosstalk channel coefficient;
  • the crosstalk cancellation coefficient processes the optical signal received on the first link to eliminate crosstalk.
  • the second processor is further configured to calculate a second error rate according to the optical signal sent by the optical network unit, according to the receiving a second error rate, adjusting the pre-emphasis coefficient; and pre-emphasizing the data received on the first link according to the adjusted second pre-emphasis coefficient to eliminate crosstalk.
  • a fifth aspect is a mode demultiplexer, the mode demultiplexer comprising:
  • a second port processing unit configured to receive the second optical signal; and output the converted single mode optical signal from the determined output port according to an instruction of the third processor;
  • the third processor is configured to determine, according to a correspondence between an output port of the optical signal and a mode of the optical signal, an output port corresponding to the mode of the received second optical signal; convert the second optical signal into a single mode optical signal instructing the second port processing unit to output the converted single mode optical signal from the determined output port.
  • a sixth aspect is a space division multiplexing system, the space division multiplexing system comprising at least the embodiment of the third aspect mentioned above.
  • system further comprises: the embodiment of the fourth aspect mentioned above.
  • a seventh aspect is a data communication device, the device comprising: a processor, a memory, and a bus system, wherein the processor and the memory are connected by the bus system, the memory is for storing instructions, and the processor is used by the processor Executing instructions stored in the memory,
  • the processor is configured to: receive, by the input port, a first optical signal sent by the optical line terminal; and convert the received first optical signal into a corresponding optical signal according to a corresponding relationship between an input port of the optical signal and a mode of the optical signal a second optical signal in a mode corresponding to the input port; multiplexing the converted second optical signal in at least a mode fiber, wherein the number of modes supported by the mode-less fiber is between a multimode fiber and a single Between the mode fibers.
  • a data communication apparatus includes: a processor, a memory, and a bus system, wherein the processor and the memory are connected by the bus system, the memory is for storing instructions, and the processor is used by the processor Executing instructions stored in the memory,
  • the processor is configured to: send a first training sequence to the optical network unit at an initial start of the optical line terminal; and connect the optical line terminal to the optical network unit according to the first training sequence
  • the first crosstalk on the first link is estimated by using a first crosstalk channel coefficient, wherein the first crosstalk on the first link between the optical line terminal and the optical network unit is shared with the first link Crosstalk of the optical signal of the second link between the other optical line terminal of the same mode-learned fiber to the second link between the other optical network unit and the first link; the first according to the estimate Crosstalking the channel coefficients to obtain a pre-emphasis coefficient; pre-emphasizing the optical signal to be transmitted on the first link according to the pre-emphasis coefficient to eliminate crosstalk.
  • an embodiment of the present invention provides a data data transmission method, apparatus, and system.
  • the data transmission method provided by the present invention can also perform channel noise estimation by transmitting a training sequence to perform denoising processing, and solves the mutual crosstalk of the optical signals in the small mode fiber, thereby deteriorating the communication performance, and realizing the noise reduction of the small mode fiber. Processing greatly improves communication performance.
  • FIG. 1 is a networking diagram of a PON system provided by the prior art
  • FIG. 2 is a schematic block diagram of an application scenario according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present invention.
  • FIG. 4 is a flow chart showing another specific description of a data transmission method according to an embodiment of the present invention.
  • FIG. 5 is a flowchart showing a detailed description of a data transmission method according to an embodiment of the present invention.
  • FIG. 6 is a schematic block diagram of a data transmission method according to an embodiment of the present invention.
  • FIG. 7 is still another schematic block diagram of a data transmission method according to an embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of a mode multiplexer according to an embodiment of the present invention.
  • FIG. 9 is a schematic block diagram of an optical line terminal according to an embodiment of the present invention.
  • FIG. 10 is a structural block diagram of a mode demultiplexer according to an embodiment of the present invention.
  • FIG. 11 is a schematic block diagram of a data communication apparatus provided in accordance with an embodiment of the present invention.
  • FIG. 2 shows a schematic block diagram of an application scenario according to an embodiment of the present invention.
  • the system is a multi-mode optical fiber-based spatial division multiplexing (SDM) system including: an optical line terminal OLT located at a central office (CO), a mode multiplexer, a mode demultiplexer and an optical network unit ONU/optical network terminal ONT; wherein the OLT is respectively connected to the mode multiplexer through a single mode fiber, and the mode multiplexer and the mode demultiplexer pass a modeless fiber optic connection, the mode demultiplexer being coupled to the one or more of the illustrated ONUs via a single mode fiber to the ONU or ONT connection or mode demultiplexer via a single mode fiber to the splitter or The ONT, the mode multiplexer transmits the optical signal sent by the optical line terminals to a small mode fiber between the mode multiplexer and the mode demultiplexer through a single mode fiber; The mode demultiplexer is configured to receive the optical signal, Each of the single-SDM
  • the mode multiplexer has a plurality of input ports
  • the mode demultiplexer has a plurality of output ports
  • the port has a corresponding relationship, for example, the optical signal received from the first input port on the mode multiplexer is forwarded through the first output port on the mode multiplexer on the mode demultiplexer.
  • FIG. 3 shows a schematic flow chart of a method of data transmission according to an embodiment of the present invention, which may be performed by a data communication device such as the mode multiplexer in FIG. 2, wherein the above method of data transmission can be applied to Figure 2 is a network architecture diagram.
  • the data transmission method is applied in a space division multiplexing system
  • the space division multiplexing system includes at least: an optical line terminal, a mode multiplexer, a mode demultiplexer, a beam splitter, and light.
  • a network unit wherein the optical line terminal is connected to the mode multiplexer through a single mode fiber, the mode multiplexer being connected to the mode demultiplexer by a mode-less optical fiber, the mode demultiplexer
  • the optical splitter is connected to the optical network unit by using a single-mode optical fiber and the optical splitter.
  • the method is as shown in FIG. 3, and the method includes:
  • the mode multiplexer receives the first optical signal sent by the optical line terminal from the input port.
  • the mode multiplexer converts the received first optical signal into a second optical signal of a mode corresponding to the input port according to a correspondence between an input port of the optical signal and a mode of the optical signal.
  • the mode multiplexer multiplexes the converted second optical signal into at least a mode fiber, wherein the number of modes supported by the mode-less fiber is between a multimode fiber and a single mode fiber.
  • the method further includes:
  • the optical line terminal sends a first training sequence to the optical network unit;
  • the optical line terminal estimates, according to the first training sequence, a first crosstalk channel coefficient of a first crosstalk on a first link between the optical line terminal and the optical network unit, where the light
  • the first crosstalk on the first link between the line termination and the optical network unit is another one or more optical line terminations sharing the same small mode fiber with the first link to another optical network unit Crosstalk between the optical signal of the second link and the first link;
  • a pre-emphasis coefficient is obtained based on the estimated first crosstalk channel coefficient.
  • the method further includes:
  • the method further includes:
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received first error rate
  • the method further includes:
  • the optical line terminal receives a second training sequence sent by the optical network unit at the beginning of the start of the operation of the optical line terminal or the start of operation of the optical network unit;
  • a second crosstalk channel coefficient for the second crosstalk on the first link between the optical network unit and the optical line terminal is another one or more optical line terminals sharing the same small mode fiber with the first link to another one or more Crosstalk of the optical signal of the second link between the optical network units to the first link;
  • a crosstalk cancellation coefficient is obtained based on the estimated second crosstalk channel coefficient.
  • the method further includes:
  • the optical line terminal processes the optical signal received on the first link according to the crosstalk cancellation coefficient to eliminate crosstalk.
  • the method further includes:
  • the optical line terminal calculates a second error rate according to the optical signal sent by the optical network unit
  • the optical line terminal adjusts the crosstalk cancellation coefficient according to the received second error rate
  • the method further includes:
  • the mode demultiplexer receives the second optical signal
  • the mode demultiplexer determines an output port corresponding to a mode of the received second optical signal according to a correspondence between an output port of the optical signal and a mode of the optical signal;
  • An embodiment of the present invention provides a data transmission method, where a first optical signal sent by an optical line terminal is received from an input port by a mode multiplexer, and the receiving is received according to a corresponding relationship between an input port of the optical signal and a mode of the optical signal. Converting the first optical signal into a second optical signal in a mode corresponding to the input port; multiplexing the converted second optical signal into at least a mode fiber for transmission,
  • the transmission capacity of the root fiber realizes the transmission of big data, realizing the rapid expansion of the transmission capacity, thereby improving the total bandwidth utilization of the system.
  • FIG. 4 shows a schematic flow chart of a method of data transmission according to an embodiment of the present invention, which may be performed by a data communication device such as the mode multiplexer in FIG. 2, wherein the above method of data transmission can be applied to Figure 2 is a network architecture diagram.
  • the data transmission method is applied in a space division multiplexing system
  • the space division multiplexing system includes at least: an optical line terminal, a mode multiplexer, a mode demultiplexer, a beam splitter, and light.
  • a network unit wherein the optical line terminal is connected to the mode multiplexer through a single mode fiber, the mode multiplexer being connected to the mode demultiplexer by a mode-less optical fiber, the mode demultiplexer
  • the optical splitter is connected to the optical network unit by a single mode fiber and the optical splitter.
  • the method is as shown in FIG. 4, and the method includes:
  • the optical line terminal sends a first training sequence to the optical network unit.
  • the optical line terminal estimates, according to the first training sequence, a first crosstalk channel coefficient of a first crosstalk on a first link between the optical line terminal and the optical network unit.
  • the first crosstalk on the first link between the optical line terminal and the optical network unit is another one or more optical line terminals sharing the same small mode fiber with the first link to another or Crosstalk of the optical signal of the second link between the plurality of optical network units to the first link.
  • the optical line terminal obtains a pre-emphasis coefficient according to the estimated first crosstalk channel coefficient.
  • the optical line terminal pre-emphasizes the optical signal to be sent on the first link according to the pre-emphasis coefficient to eliminate crosstalk.
  • the method further includes:
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received first error rate.
  • the method further includes:
  • the line terminal receives the second training sequence sent by the optical network unit;
  • the optical line terminal performs a second crosstalk channel on the second crosstalk on the first link between the optical network unit and the optical line terminal according to the second training sequence sent by the optical network unit Estimating a coefficient, wherein the second crosstalk on the first link between the optical network unit and the optical line terminal is another one or more lights sharing the same small mode fiber with the first link Crosstalk of the optical signal of the second link between the line termination and the other optical network unit to the first link;
  • the optical line terminal obtains a crosstalk cancellation coefficient according to the estimated second crosstalk channel coefficient.
  • the method further includes:
  • the optical line terminal processes the optical signal received on the first link according to the crosstalk cancellation coefficient to eliminate crosstalk.
  • the method further includes:
  • the optical line terminal calculates a second error rate according to the optical signal sent by the optical network unit
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received second error rate.
  • the optical line terminal sends a first training sequence to the optical network unit at the beginning of an optical line terminal, and the light is used according to the first training sequence.
  • the mutual crosstalk of the optical signals in the mode-less optical fiber is solved to deteriorate the communication performance, and the denoising processing of the small-mode optical fiber is realized, and the communication performance is greatly improved.
  • FIG. 5 it is a specific flowchart of another method of data transmission.
  • the method for data transmission is applied to the networking architecture of FIG. 2.
  • FIG. 2 For details of the networking architecture, refer to the corresponding description in FIG. 2, which is briefly described as follows:
  • the method is applied in a space division multiplexing system, the space division multiplexing system at least comprising: an optical line terminal, a mode multiplexer, a mode demultiplexer, a beam splitter, and an optical network unit, wherein the optical line
  • the terminal is connected to the mode multiplexer through a single mode fiber
  • the mode multiplexer is connected to the mode demultiplexer through a mode-less optical fiber
  • the mode demultiplexer passes through the single mode fiber and the optical splitter
  • the optical splitter is connected to the optical network unit, and the method includes:
  • the method can be divided into a training phase and a work phase, which are described in detail below:
  • the optical line terminal sends a first training sequence to the optical network unit.
  • the downlink joint transmission and the uplink joint reception mode can be adopted to ensure that the existing ONU can be changed or less changed.
  • the downlink direction may perform channel noise estimation by transmitting a training sequence to perform denoising processing, and then adjust the noise cancellation coefficient in real time according to the error information feedback on the ONU/ONT side.
  • the optical line terminal estimates, according to the first training sequence, a first crosstalk channel coefficient of a first crosstalk on a first link between the optical line terminal and the optical network unit.
  • the first crosstalk on the first link between the optical line terminal and the optical network unit is another one or more optical line terminals sharing the same small mode fiber with the first link to another or Crosstalk of the optical signal of the second link between the plurality of optical network units to the first link.
  • the method further includes:
  • the optical line terminal pre-emphasizes the optical signal to be sent on the first link according to the pre-emphasis coefficient to eliminate crosstalk.
  • FIG. 6 is a schematic block diagram of data transmission. details as follows:
  • FIG. 6 is a schematic block diagram of data transmission.
  • the OLT performs crosstalk processing on the data to be transmitted.
  • channel coefficient estimation can be performed by transmitting a training sequence to perform denoising processing, and then the noise cancellation coefficient is adjusted in real time according to the error information feedback on the ONU/ONT side.
  • the crosstalk cancellation processing is performed in the OLT in Figure 6 above, as follows:
  • the method further includes:
  • the optical line terminal receives a first error rate transmitted by an optical network unit connected by the first link.
  • the optical network unit connected to the optical line terminal receives the optical signal sent by the optical line terminal, and finds that the error rate of the received optical signal increases, the error rate is sent to the optical line terminal for adjusting the crosstalk.
  • the channel coefficient which in turn adjusts the pre-emphasis coefficient.
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received first error rate.
  • the optical line terminal pre-emphasizes the optical signal to be transmitted on the first link according to the adjusted pre-emphasis coefficient to eliminate crosstalk.
  • the line terminal receives a second training sequence sent by the optical network unit at the beginning of the start of the optical line terminal or when the optical network unit starts working.
  • the line terminal performs crosstalk channel coefficient estimation on crosstalk on the first link between the optical network unit and the optical line terminal according to a second training sequence sent by the optical network unit.
  • the second crosstalk on the first link between the optical network unit and the optical line terminal is another one or more optical line terminals sharing the same small mode fiber with the first link to another Crosstalk of the optical signal of the second link between one or more optical network units to the first link.
  • the line terminal obtains a crosstalk cancellation coefficient according to the estimated crosstalk channel coefficient.
  • the error rate is calculated on the optical line terminal side for adjusting the second crosstalk channel coefficient, and then adjusting the second pre-emphasis coefficient.
  • the method further includes:
  • the optical line terminal processes the optical signal received on the first link according to the crosstalk cancellation coefficient to eliminate crosstalk.
  • the method includes:
  • the optical line terminal calculates a second error rate according to the optical signal sent by the optical network unit.
  • the optical line terminal adjusts the pre-emphasis coefficient according to the received second error rate.
  • the optical line terminal pre-emphasizes the data sent by the received optical network unit according to the adjusted pre-emphasis coefficient to eliminate crosstalk.
  • the flow of the above method mainly eliminates crosstalk on the OLT side, thereby ensuring that the communication performance of the system architecture diagram as shown in FIG. 2 can be ensured and the reliability of data transmission is ensured.
  • the method further includes:
  • the mode multiplexer receives the first optical signal sent by the optical line terminal from the input port.
  • the first optical signal is a first optical signal after the crosstalk cancellation processing of the above S500-S524.
  • S500-S524 For the specific crosstalk process, refer to the detailed description of S500-S524, which will not be described here.
  • the mode multiplexer is configured according to a mode of an optical port and an optical signal. And converting the received first optical signal into a second optical signal of a mode corresponding to the input port.
  • the mode multiplexer multiplexes the converted second optical signal into at least a mode optical fiber, where the number of modes supported by the mode-less optical fiber is between a multimode fiber and a single mode fiber.
  • the mode demultiplexer receives the above optical signal and further processes, including:
  • the mode demultiplexer receives the second optical signal, and determines an output port corresponding to the mode of the received second optical signal according to a correspondence between an output port of the optical signal and a mode of the optical signal.
  • the OLT is respectively connected to the input port of the mode multiplexer through a single mode fiber, and the mode multiplexer converts the mode of the optical signal according to the input port, for example, input.
  • the optical signal mode of port 1 still keeps LP01 unchanged, the optical signal mode of input port 2 is converted into LP11a mode, and the optical signal mode of input port 3 is converted into LP11b mode, and the signals of various modes are multiplexed after conversion.
  • On the mode-less fiber it is transmitted to the input of the mode-connected multiplexer.
  • the mode demultiplexer converts it into the LP01 mode signal according to the mode of the signal and outputs it to different output ports.
  • the signal of the LP01 mode is directly converted.
  • Output to output port 1 convert LP11a mode signal into LP01 mode signal output to output port 2, convert LP11b mode signal into LP01 mode signal output to output port 3.
  • the optical signal output by the mode multiplexer can be directly received by one ONU/ONT, or can be received by multiple ONUs/ONTs through the splitter. The same is true for the upside.
  • the embodiment of the invention provides a data data transmission method, device and system.
  • the data transmission method provided by the present invention can also perform channel noise estimation by transmitting a training sequence to perform denoising processing, and solves the mutual crosstalk of the optical signals in the small mode fiber, thereby deteriorating the communication performance, and realizing the noise reduction of the small mode fiber. Processing greatly improves communication performance.
  • FIG. 8 is a mode multiplexer, and the mode multiplexer includes:
  • a first port processing unit 800 configured to receive a first optical signal sent by an optical line terminal from a self input port; and multiplex the converted second optical signal into at least a mode optical fiber according to an instruction of the first processor ;
  • the first processor 802 is configured to convert the received first optical signal into a second optical signal in a mode corresponding to the input port according to a correspondence between an input port of the optical signal and a mode of the optical signal;
  • the port processing unit is instructed to multiplex the second optical signal into at least a mode fiber, wherein the number of modes supported by the mode-less fiber is between the multimode fiber and the single mode fiber.
  • the embodiment of the present invention provides a mode multiplexer that receives a first optical signal sent by an optical line terminal from an input port; and according to a correspondence between an input port of the optical signal and a mode of the optical signal, Transmitting the received first optical signal into a second optical signal in a mode corresponding to the input port; multiplexing the converted second optical signal into at least a mode optical fiber, and realizing transmission capacity of a single optical fiber.
  • a mode multiplexer that receives a first optical signal sent by an optical line terminal from an input port; and according to a correspondence between an input port of the optical signal and a mode of the optical signal, Transmitting the received first optical signal into a second optical signal in a mode corresponding to the input port; multiplexing the converted second optical signal into at least a mode optical fiber, and realizing transmission capacity of a single optical fiber.
  • FIG. 9 is an optical line terminal, where the optical line terminal includes:
  • a first transmitter 900 configured to: when the optical line terminal is activated, the optical line terminal sends a first training sequence to the optical network unit; and send the pre-emphasized optical signal according to an instruction of the second processor ;
  • the second processor 902 is configured to estimate, according to the first training sequence, a first crosstalk channel coefficient of a first crosstalk on a first link between the optical line terminal and the optical network unit, where The first crosstalk on the first link between the optical line terminal and the optical network unit is another one or more optical line terminals sharing the same small mode fiber with the first link to another or Crosstalk of the optical signal of the second link between the plurality of optical network units to the first link; obtaining a pre-emphasis coefficient according to the estimated first crosstalk channel coefficient; according to the pre-emphasis coefficient, Pre-emphasizing the optical signal to be transmitted on the first link; and instructing the transmitter to transmit the pre-emphasized optical signal.
  • optical line terminal further includes:
  • a first receiver 904 configured to receive a first error rate sent by an optical network unit connected by the first link;
  • the second processor 902 is further configured to adjust the pre-emphasis coefficient according to the received first error rate
  • the first transmitter 900 is further configured to send a pre-process according to an instruction of the second processor.
  • the weighted light signal is further configured to send a pre-process according to an instruction of the second processor.
  • the first receiver 904 is further configured to: at the beginning of the start of the operation of the optical line terminal or the start of operation of the optical network unit, the line terminal receives a second training sequence sent by the optical network unit;
  • the second processor 902 is further configured to perform, according to a second training sequence sent by the optical network unit, a second crosstalk on the first link between the optical network unit and the optical line terminal.
  • Estimating a second crosstalk channel coefficient wherein the second crosstalk on the first link between the optical network unit and the optical line terminal is another one of the same small mode fiber shared with the first link or Crosstalk of the optical signal of the second link between the plurality of optical line terminals to the other optical network unit to the first link; obtaining a crosstalk cancellation coefficient according to the estimated second crosstalk channel coefficient; And processing the optical signal received on the first link according to the crosstalk cancellation coefficient to eliminate crosstalk.
  • the second processor 902 is further configured to calculate a second error rate according to the optical signal sent by the optical network unit, and adjust the pre-emphasis coefficient according to the received second error rate. And pre-emphasizing the data received on the first link according to the adjusted second pre-emphasis coefficient to eliminate crosstalk.
  • the optical line terminal sends a first training sequence to the optical network unit at the beginning of an optical line terminal, and the light is used according to the first training sequence.
  • the mutual crosstalk of the optical signals in the mode-less optical fiber is solved to deteriorate the communication performance, and the denoising processing of the small-mode optical fiber is realized, and the communication performance is greatly improved.
  • FIG. 10 is a block diagram of the structure demultiplexer.
  • the mode demultiplexer includes:
  • a second port processing unit 1000 configured to receive a second optical signal; and output the converted single mode optical signal from the determined output port according to an instruction of the third processor
  • the third processor 1002 is configured to determine, according to a correspondence between an output port of the optical signal and a mode of the optical signal, an output port corresponding to a mode of the received second optical signal;
  • the optical signal is converted into a single mode optical signal, and the second port processing unit is instructed to output the converted single mode optical signal from the determined output port.
  • the embodiment of the present invention provides a mode demultiplexer for receiving a second optical signal, and determining, according to a corresponding relationship between an output port of the optical signal and a mode of the optical signal, An output port corresponding to the mode of the two optical signals; converting the second optical signal into a single mode optical signal, instructing the second port processing unit to output the converted single mode optical signal from the determined output port
  • the invention also provides a space division multiplexing system, and the specific networking structure is shown in FIG. 2 .
  • the space division multiplexing system includes: an optical line terminal, a mode multiplexer, a mode demultiplexer, and an optical network unit.
  • an optical line terminal for the function of each specific module, refer to the detailed description of FIG. 8 to FIG. :
  • a mode multiplexer configured to receive, by the input port, a first optical signal sent by the optical line terminal; and converting the received first optical signal into and according to the corresponding relationship between the input port of the optical signal and the mode of the optical signal Inputting a second optical signal of a mode corresponding to the port; multiplexing the converted second optical signal into at least a mode fiber, wherein the number of modes supported by the mode-less fiber is between multimode fiber and single mode Between the fibers.
  • An optical line terminal configured to send a first training sequence to the optical network unit at the beginning of the start of the optical line terminal; and to first connect the optical line terminal to the optical network unit according to the first training sequence
  • the first crosstalk on the link is estimated by using the first crosstalk channel coefficient, wherein the first crosstalk on the first link between the optical line terminal and the optical network unit is the same as the first link Crosstalk of the optical signal of the second link between the other optical line terminal of the modeless fiber to the second link or another optical network unit to the first link; according to the estimated first crosstalk channel a coefficient, a pre-emphasis coefficient is obtained; and the optical signal to be transmitted on the first link is pre-emphasized according to the pre-emphasis coefficient to eliminate crosstalk.
  • a mode demultiplexer configured to receive a second optical signal sent by the mode multiplexer; and determine an output corresponding to a mode of the received second optical signal according to a correspondence between an output port of the optical signal and a mode of the optical signal a port; converting the second optical signal into a single mode optical signal, and outputting the converted single mode optical signal from the determined output port.
  • an embodiment of the present invention further provides a data communication apparatus 1100, which is characterized in that the apparatus 1100 includes a processor 1110, a memory 1120, and a bus system 1130.
  • the processor 1110 and the memory 1120 are connected by the bus system 1130.
  • the memory 1120 is configured to store instructions, and the processor 1110 is configured to execute instructions stored by the memory 1120.
  • the processor 1110 is configured to receive, by the input port, a first optical signal sent by the optical line terminal, and convert the received first optical signal into and according to a corresponding relationship between an input port of the optical signal and a mode of the optical signal. a second optical signal of the mode corresponding to the input port; multiplexing the converted second optical signal into at least a mode fiber, wherein the number of modes supported by the mode-less fiber is between a multimode fiber and Between single mode fibers. or,
  • the processor 1110 is configured to send a first training sequence to the optical network unit at the beginning of the start of the optical line terminal, and to connect the optical line terminal to the optical network unit according to the first training sequence.
  • the first crosstalk on the first link is estimated by using a first crosstalk channel coefficient, wherein the first crosstalk on the first link between the optical line terminal and the optical network unit is shared with the first link Crosstalk of the optical signal of the second link between the other optical line terminal of the same mode-learned fiber to the second link between the other optical network unit and the first link; the first according to the estimate Crosstalking the channel coefficients to obtain a pre-emphasis coefficient; pre-emphasizing the optical signal to be transmitted on the first link according to the pre-emphasis coefficient to eliminate crosstalk.
  • the processor 1110 may be a central processing unit (“CPU"), and the processor 1010 may also be other general-purpose processors, digital signal processors (DSPs). , an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, and the like.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 1120 can include read only memory and random access memory and provides instructions and data to the processor 1010. A portion of the memory 1120 can also include a non-volatile random access memory. For example, the memory 1120 can also store information of the device type.
  • the bus system 1130 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 1130 in the figure.
  • each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 1110 or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as hardware processor execution, or use hardware and software modules in the processor.
  • the combination execution is completed.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1120, and the processor 1110 reads the information in the memory 1120 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and / or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, may be located in one place. Or it can be distributed to multiple network elements. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention contributes in essence or to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé, un appareil et un système de transmission de données. Le procédé comprend les étapes suivantes : un multiplexeur en modes reçoit, en provenance d'un port d'entrée, un premier signal optique envoyé par un terminal de ligne optique; conformément à une correspondance entre un port d'entrée d'un signal optique et un mode du signal optique, le multiplexeur en modes convertit le premier signal optique reçu en un deuxième signal optique d'un mode correspondant au port d'entrée; puis il multiplexe le second signal optique converti pour une fibre à peu de modes pour la transmission. Des transmissions de données massives sont réalisées en améliorant la capacité de transmission d'une seule fibre, et l'accroissement rapide de la capacité de transmission est réalisée, ce qui permet d'augmenter le taux d'utilisation total de la largeur de bande du système.
PCT/CN2014/095979 2014-12-31 2014-12-31 Procédé, appareil, et système de transmission de données WO2016106714A1 (fr)

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PCT/CN2014/095979 WO2016106714A1 (fr) 2014-12-31 2014-12-31 Procédé, appareil, et système de transmission de données
CN201480077221.7A CN106664638A (zh) 2014-12-31 2014-12-31 一种数据传输的方法、装置和系统
EP14909522.6A EP3232713A4 (fr) 2014-12-31 2014-12-31 Procédé, appareil, et système de transmission de données
US15/640,167 US20170302399A1 (en) 2014-12-31 2017-06-30 Data transmission method, apparatus, and system

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CN110190899B (zh) * 2019-06-11 2020-06-19 北京科技大学 一种灵活高速的自由空间-少模光纤混合通信装置
CN114944868B (zh) * 2022-03-22 2024-06-28 江苏科大亨芯半导体技术有限公司 一种无源光网络的调顶系统

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